Clamp



July 21, 1.9225.

l E. E. NOBLE CLAMP Filed Jan. 12, 1925 @Lbbgjm m36.

Patented July 21, 1925. Y

UNITED STATES APn'rsiv'r oFFicE. i

` iin-Nasr n. NOBLE, on LEAD, SOUTH insurers.`

. CLAMP.

Application filed .l'anuary 12, 1925. Serial No. 2,000.

To all fw hom' t may concern Bye. it known that I, EnNEsT E. NOBLE, a citizen of the United States, residing at Lead, in the county'of Lawrence and State of South Dakota, have invented certain new and useful Improvements in Clamps; and I do hereby declare the following to beI a full, clear, andexact description ofthe invention, suoli as vwill enable others skilled in the Yart to which it appertains to make and use the same.

l'The present invention relates to improve- ,A ments in clamps and more particularly re- Y ventionintendstoremedy this situation by givingy the trunnion a' full cylindrical bear- A ing on the retaining wall at the upperpoi v tionv thereof, great strength being secured and `excessive `wear on the column arm clamp being avoided. y A

Another object of theinvention consists in providing for a simpler assembly of the 'parts and to diminish the great amount of `friction necessarily encountered with 'the usen ofthe `closed bottomv wall 15 in the patent. l i

y Agfuithei object of the invention resides iii providing a securing bolt that will permit of removing it entirely from both parts "of theclainp, so that should the threads or other parts become worn, it is no longer necessary toremove` the clamp to the shop to` replace the bolt, but this replacement may be made by the miner-himself at the point ofdrilling. f i

.VViththe foregoing and other objects in view,the` invention consists in the construc-V tion, combination 'and' arrangement of parts more fully described hereinafter and more particularly Vpointed out in the appended In the dra-wings, wherein like symbols refer to like or corresponding parts throughout the several views: Y

Figure l is a fragmentary perspective view showing a drilling machine with the invention applied thereto;

Figure 2 is an enlarged plan view of the clamp, with a portion of the drill arm broken away;

Figure 3 is a side elevation of the clamp on an enlarged scale; l

Figure V4:` is a perspective view of one member of the clamp; and i Figure is a similar view of the other member of the clamp. Referring more particularly to the drawings 6 and-7 designate generally the two arts or elements forinino the clam -these P es i elements having complen'ientary formed surf faces for fitting aboutV an object. The surfaces shown are the semi-cylindrical Vdepressions 8 and 9, disposed opposite one another and adapted to fit al cylindrical bearing such as the drill column l0, shown in Fig. l.V Theparts 6 and 7 of the clamp are made of cast iron or other Vappropriate material, and they may be suitably reinforcedby ribs and thelike.

At one end the clamp member 6 is pro vided with a head l2 projecting substantially radially from the cylindrical,bearing formed by the two members or substantially radially from `the drill column l0. The

center line or .diameter of the head l2 subd stantially coincides with the diameter of the drill column 10 or combined cylindrical bearing surfaces 8 and 9, and portions of the head 2 overlap the radial' line of contact between the two members. substantially cylindrical bearing surface 4la closed-entirely atits top portion by the re taining wall 13. Below this wall is a slot 1l open at the bottom to permit of the. insertion and the turning therein to a limited extent of the web l5, which connects the cylindrical trunnionl tothe other member 7 of the clamp. Thecylindrical bearing 14: is a Vtrue complete cylinder only at the top portion of the head l2, but save for the slot 11 this bearing extends all the way to the bottom of the head and opens at both upper and lower ends. The upper portion of the web l5 on the companion clampimember 7 is re- /Vitliin the head 12 is a moved, or the trunnion 16 extends above the web to leave a space between the upper part of the trunnion and the adjacent part of the clamp. member to receive the retaining wall 13 ot the head 12. The trunnion 16 is inserted through the lower end ot the bearing 14 and pushed up substantially into the position shown in Fig. 3, where this trunnion lits snugly for tree rotation in the bearing and occupies substantially the entire bearing, although the lower end of the trunnion is spaced above the lower end of the head 12, in order to accommodate the cotter pin or key 17, which is inserted through the openings 18 and 19 made at diametrically opposite points in the head 12. These openings are made substantially above the lower end of the head in order not to unduly weaken the metal and to secure ample strength tor supporting the trunnion and connected clamp member. The cotter pin or key vis of restricted surface area and contacts only with a very small portion of the area ot the lower end of the trunnion 16 and hence friction between the two parts incident to the rotation of the trunnion 16 is reduced to a minimum. The center oft the trunnion also coincides with the diameter of the drill column in order to permitthe clamp members to close abo-ut the drill column, but limited relative rotary movement being permitted in the two clamp members by virtue of the fact that the web 15 is o't less width as compared with the slot 11 in the head 12. The clamp member 6 is provided with a shoulder 20 extending substantially diametrically of the head 12 and adjoining the head for use inV cooperating with the similar shoulder 21 made upon the other clamp member or upon the web 15, these shoulders being arranged to abut when the clamp is entirely closed. The clamp member 7 upon the end opposite the trunnion is provided with spaced horns. 22 and 23 for receiving therebetween the threaded bolt 24 having a nut 25 and one or more washers 26, the washers adapted to engage against the outer faces of the horns 22 and 23. Such outer faces are made at substantially right angles to the axis oir' the bolt 24, in order to avoid the slipping of the bolt out of the horns. The slot or space between the two horns is open at its outer end to permit of a swinging` movement of the bolt in moving into and out of operative po'` sition. The other end of the bolt is provided with a T-head 27 itting within the socket 28 madein the rear portions of the spaced lugs 2S) and 30 cast or otherwise provided upon the end of the clamp member 6 opposite to the head 12. The lugs are open or slotted as indicated at 31 between their rear portions, but are connected together at the part indicated at 32 for the purpose of reinforcing the lugs at this point. The two branches of the T-head it in Sockets of the lugs 29 and 30 and the shank passes through the slot 31. The bolt is enabled to swing as the T-head is ot rounded cross-section and the socket 28 made accordingly. The tact that the lugs 29 and' 30 are spaced apart permits the iree swinging of the bolt and the connected part- 32 prevents the bolt from becoming disconnected except when the nut 25 and washers 26 are removed and the bolt drawn axially through the opening 31. This construction permits the miner to remove the bolt when the threads are worn or when the bolt is otherwise in capacitated at the place of work without having to remove the entire clamp member and transfer it to a workshop.

The clamp may be Afitted about the drill column 10, as shown in Fig. 1 for securing the drill arm 32 in position, this drill arm being secured to one of the clamp members, for instance the clamp member 6, as represented. The drilling machine 33 is affixed to this arm 32, and the column will permit of varying the height of the drilling machine and also for the angular adjustment thereof about the column.

in the use ot the device, the clamp members are assembled by fitting the trunnion 16 up through the cylindrical bearing 14 in the head 12 ot the companion member 6 and subsequently inserting the cotter pin 17 through the openings 18 and 19. The member 7 will thus be supported upon the cotter pin and will be free to rotate thereon, the cotter' pin at the same time providing for the` ready disassembly of the members by virtue oli' its easy removability. The upper end of the trunnion fits snugly into the closed cylindrical top portion of the bearing and relative movement of the two clamp members in a direction axially of the drill columnis prevented, as the top edge of the web 15 will avoid movement in one direction by cooperating with the lower edge of the retaining wall 13 of the head 12 and the cotter pin will prevent downward movement of the trunnion or upward relative movement of the other clamp member.

The clamp members are tightly closed into lgripping engagement with the drill column by tightening the nut 25 upon the bolt 24. This action causes the drawing together of the clamp members about the trunnion center. Wlhen the nut- 25 is reversely rotated, the clamp members are permitted to open a relatively great distance, so as to loosen the same and permit adjustment either axially or circumterentially upon the drill column. 1t is also a comparatively easy operation to remove the cotter pin 17 to secure the disassembly ot the two clamp members.

, On the arm32 is shown a clamp member constructed according to my prior Patent No. 1,509,022 as this particular clamp member is found adapted for use at this particular point. It is quite obvious, however, that the present form of clamp member may be utilized also at this point.

I desire it to be understood that the drawings only show one embodiment of which the invention is susceptible, and those skilled in the art will, of course, be enabled to change the size and proportion of the device and parts thereof and to make other constructional changes therein, but I reserve the right to alter such changes and modifications as come within the scope of the following claims.

I claim:

l. A clamp comprising complementary clamp members, one of said members having a head proj ecting from one side thereof, with a substantially cylindrical recess therein closed all around at its upper side portion to form a continuously cylindrical bear ing and having a slot below the closed upper portion and opening upon the bottom edge of the head, said .slot having side Walls running from the open bottom substantially straight to the closed top portion, a trunnion on the other clamp member adapted to Abe tted up through said recess and into the cylindrical bearing at the upper portion of the head, a web connecting said trunnion with the clamp member and being thinner than said slot is wide whereby to permit the web to rotate in said slot back and forth between said straight side walls, said web being spaced below the upper end of the trunnion and lying below said closed upper side portion of the head, a narrow key removably fitted diametrically across the lower portion of said bearing beneath said trunnion to receive `theweight of the latter at its intermediate portion, and means at the free edges of said clamp members for drawing the same together.

2. A clamp comprising companion clamp members hinged together at one side, spaced horns upon the free end of one member, spaced lugs on the free end of the other member disposed opposite said horns, said Vlugs having complemental sockets in their rear faces, a member connecting said lugs together at their rear outer end portions whereby to reinforce the lugs at the outer sides of said sockets, a T-headed bolt, the lateral portions of the head of said bolt adapted to fit in the sockets in said lugs and to turn therein, the shank of the bolt adapted to fit between said lugs and to rotate freely therein being restricted by said connecting member and prevented from escape from the space between said lugs, and a nut on said bolt adapted to engage with said horns of the other member.

ERNEST E. NOBLE. 

